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Hook up SM/RM 47/1047-1049 and enable alternate screen buffers for term
applications.
(David: rebased on top of -git, renamed helpers and added docs)
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Terminal state can be saved/restored by applications. To simplify our
internal handling, put all affected state into a separate object.
Especially with alternate screen buffers, this will simplify our code
significantly.
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Instead of increasing the screen-age on redraw, we now increase it only on
real updates. This is effectively the same, but avoids increased age
counters on backbuffer rendering. Therefore, we can now check age counters
against fronbuffers safely, while rendering frames in background.
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Terminals use pseudo color-codes mixed with 8bit and 24bit colors. Provide
a color-converter so external renderers only have to deal with ARGB32
colors.
This requires a color-palette as input as there's no fixed mapping. We
provide a default, but maybe we wanna support external palettes in the
future.
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This is the most simple way to render cursors: flip attr->inverse of the
cursor cell. This causes the background and foreground colors of the
cursor-cell to be inversed.
Now that we render cursors ourselves, make subterm not call into the
parent terminal to render cursors.
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If we hide or show the cursor, we change visual attributes and have to
mark the underlying cell as dirty. Otherwise, the terminal will not be
redrawn.
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Implement the feed_keyboard() handling by mapping XKB keys according to
DEC-VT behavior.
Public information on terminal key-mappings is pretty scarce. We only
implement the most basic mapping for now. Further improvements welcome!
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We don't want to expose the term_screen internals for rendering.
Therefore, provide an iterator that allows external renderers to draw
terminals.
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Lets return the parsed length in term_utf8_decode() instead of a buffer
pointer. Store the pointer in the passed argument.
This makes it adhere to the systemd coding-style, were we always avoid
returning pointers, but store them in output arguments. In this case, the
storage is not allocated, so it doesn't fit 100% to this idiom, but still
looks much nicer.
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Allow term users to retrieve the page dimensions of a terminal screen.
This is needed to properly calculate the grid dimensions when rendering.
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The screen-layer represents the terminal-side (compared to the host-side).
It connects term_parser with term_page and implements all the required
control sequences.
We do not implement all available control sequences. Even though our
parser recognizes them, there is no need to handle them. Most of them are
legacy or unused. We try to be as compatible to xterm, so if we missed
something, we can implement it later. However, all the VT510 / VT440 stuff
can safely be skipped (who needs terminal macros? WTF?).
The keyboard-handling is still missing. It will be added once
systemd-console is available and we pulled in the key-definitions.
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